Acknowledgements
The financial support of the Deutsche Forschungsgemeinschaft
(the trilateral OLIVEOIL SCHA849/13-1 research project) is gratefully
acknowledged. Dr. Arnon Dag and Mr. Isaac Zipori (Gilat
Research Center, ARO) are thanked for their help in preparing the soil
sampling plots in Gilat and Negba. Dr. Ahmed Nasser (The Volcani
Center, ARO, Israel) is thanked for his help in managing the soil samples.
Technical help from Mrs. Alla Usyskin (The Volcani Center) is
acknowledged. The fruitful discussions with Prof. Dr. Gabriele E.
Schaumann, Dr. Benjamin Peikert and Mr. Markus Kurtz (The
Koblenz-Landau University, Germany) are greatly appreciated. The
two anonymous reviewers are thanked for the useful comments.